samples/bpf: Extend RLIMIT_MEMLOCK for xdp_{sample_pkts, router_ipv4} (6a545761) · Commits · 戴 / test

There is a common problem with xdp samples that happens when user wants to run a particular sample and some bpf program is already loaded. The default 64kb RLIMIT_MEMLOCK resource limit will cause a following error (assuming that xdp sample that is failing was converted to libbpf usage): libbpf: Error in bpf_object__probe_name():Operation not permitted(1). Couldn't load basic 'r0 = 0' BPF program. libbpf: failed to load object './xdp_sample_pkts_kern.o' Fix it in xdp_sample_pkts and xdp_router_ipv4 by setting RLIMIT_MEMLOCK to RLIM_INFINITY. Signed-off-by:

Maciej Fijalkowski <maciej.fijalkowski@intel.com> Reviewed-by:

Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by:

Jesper Dangaard Brouer <brouer@redhat.com> Acked-by:

John Fastabend <john.fastabend@gmail.com> Signed-off-by:

Daniel Borkmann <daniel@iogearbox.net>

samples/bpf/xdp_router_ipv4_user.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -25,6 +25,7 @@
		#include <sys/syscall.h>
		#include "bpf_util.h"
		#include "bpf/libbpf.h"
		#include <sys/resource.h>

		int sock, sock_arp, flags = 0;
		static int total_ifindex;
		@@ -609,6 +610,7 @@ cleanup:

		int main(int ac, char **argv)
		{
		struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
		struct bpf_prog_load_attr prog_load_attr = {
		.prog_type = BPF_PROG_TYPE_XDP,
		};
		@@ -635,6 +637,11 @@ int main(int ac, char **argv)
		ifname_list = (argv + 1);
		}

		if (setrlimit(RLIMIT_MEMLOCK, &r)) {
		perror("setrlimit(RLIMIT_MEMLOCK)");
		return 1;
		}

		if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd))
		return 1;

samples/bpf/xdp_sample_pkts_user.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -12,6 +12,7 @@
		#include <signal.h>
		#include <libbpf.h>
		#include <bpf/bpf.h>
		#include <sys/resource.h>

		#include "perf-sys.h"
		#include "trace_helpers.h"
		@@ -99,6 +100,7 @@ static void sig_handler(int signo)

		int main(int argc, char **argv)
		{
		struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
		struct bpf_prog_load_attr prog_load_attr = {
		.prog_type = BPF_PROG_TYPE_XDP,
		};
		@@ -114,6 +116,11 @@ int main(int argc, char **argv)
		return 1;
		}

		if (setrlimit(RLIMIT_MEMLOCK, &r)) {
		perror("setrlimit(RLIMIT_MEMLOCK)");
		return 1;
		}

		numcpus = get_nprocs();
		if (numcpus > MAX_CPUS)
		numcpus = MAX_CPUS;

Admin message